An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Bailey IS, Karran SE, Toyn K, Brough P, Ranaboldo C, Karran SJ.Bailey IS, et al. Among authors: karran sj.BMJ. 1992 Feb 22;304(6825):469-71. doi: 10.1136/bmj.304.6825.469.BMJ. 1992.PMID: 1547415Free PMC article.
McDonald PJ, Royle GT, Taylor I, Karran SJ.McDonald PJ, et al. Among authors: karran sj.J R Soc Med. 1991 Apr;84(4):213-6. doi: 10.1177/014107689108400410.J R Soc Med. 1991.PMID: 2027147Free PMC article.